Ch 12-2 Bilogy

Chapter 12 Section 2: The ontogenesis of Cellular tone The Evolution of Prokaryotes * Fossil- preserved or mineralized remains or organize of beingness that lived long ago. * Cyanobacteria- photosynthetic prokaryotes that produced oxygen into ocean and onto atmosphere. ii Groups of Prokaryotes * true bacteria (bacteria) - prokaryotes that contain petidoglycan in mobile phone walls and legion(predicate) a(prenominal) cause complaint/decay. * Archaebacteria-prokaryotes that lack peptidoglycan in cell walls and sire unique lipids in membranes. The Evolution of Eukaryotes * First eukaryotes appeared ab denounce 1.5 billion years ago. The Origins of Mitochondria and Chloroplasts * more(prenominal) or less biologists debate that they (^^) originated from theory of endosymbosis- mitochondria> descendants of symbiotic, aerobic eubacteria; chloroplasts> descendants of symbiotic, photosynthetic eubacteria. * Thought that bacteria entered large prokaryote and lived in cell either through cellular resp. or photosyn. * as good as similar: * Size and structure * Genetic somatic * Ribosomes * Reproduction Multicellularity * Protists- make up large, alter group that includes twain multicellular and unicellular organisms (eukaryotes).

* Multicellularity has many advantages over unicellularity because multicell organisms have more than one cell to carry out activities. * Mostly anything conspicuous with naked eye is multicellular (700 one one million million million years old) * Not all multicellular lines produce d! ivers(prenominal) organisms. * From these protists sprung 3 other kingdomsFungi, Plantae, and Animalia. Origins of Modern Organisms * Cambrian period was a fourth dimension of great evolutionary expansion. * The Ordovician period, followed Cambrian resulted in many more animals in the seas. muckle Extinctions * Extinction- death of all members of a species. * Mass out(p)ion- episode during which large numbers of species become extinct (5) * 440, 360, 245, 210, 65 million...If you want to get a full essay, piece it on our website: OrderCustomPaper.com

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